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-rw-r--r--gdb/solib-target.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/gdb/solib-target.c b/gdb/solib-target.c
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+/* Definitions for targets which report shared library events.
+
+ Copyright (C) 2007
+ Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+#include "defs.h"
+#include "objfiles.h"
+#include "solist.h"
+#include "symtab.h"
+#include "symfile.h"
+#include "target.h"
+#include "vec.h"
+
+#include "gdb_string.h"
+
+DEF_VEC_O(CORE_ADDR);
+
+/* Private data for each loaded library. */
+struct lm_info
+{
+ /* The library's name. The name is normally kept in the struct
+ so_list; it is only here during XML parsing. */
+ char *name;
+
+ /* The base addresses for each independently relocatable segment of
+ this shared library. */
+ VEC(CORE_ADDR) *segment_bases;
+
+ /* The cached offsets for each section of this shared library,
+ determined from SEGMENT_BASES. */
+ struct section_offsets *offsets;
+};
+
+typedef struct lm_info *lm_info_p;
+DEF_VEC_P(lm_info_p);
+
+#if !defined(HAVE_LIBEXPAT)
+
+static VEC(lm_info_p)
+solib_target_parse_libraries (const char *library)
+{
+ static int have_warned;
+
+ if (!have_warned)
+ {
+ have_warned = 1;
+ warning (_("Can not parse XML library list; XML support was disabled "
+ "at compile time"));
+ }
+
+ return NULL;
+}
+
+#else /* HAVE_LIBEXPAT */
+
+#include "xml-support.h"
+
+/* Handle the start of a <segment> element. */
+
+static void
+library_list_start_segment (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data, VEC(gdb_xml_value_s) *attributes)
+{
+ VEC(lm_info_p) **list = user_data;
+ struct lm_info *last = VEC_last (lm_info_p, *list);
+ ULONGEST *address_p = VEC_index (gdb_xml_value_s, attributes, 0)->value;
+
+ VEC_safe_push (CORE_ADDR, last->segment_bases, address_p);
+}
+
+/* Handle the start of a <library> element. */
+
+static void
+library_list_start_library (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data, VEC(gdb_xml_value_s) *attributes)
+{
+ VEC(lm_info_p) **list = user_data;
+ struct lm_info *item = XZALLOC (struct lm_info);
+ const char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
+
+ item->name = xstrdup (name);
+ VEC_safe_push (lm_info_p, *list, item);
+}
+
+/* Handle the start of a <library-list> element. */
+
+static void
+library_list_start_list (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data, VEC(gdb_xml_value_s) *attributes)
+{
+ char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value;
+
+ if (strcmp (version, "1.0") != 0)
+ gdb_xml_error (parser,
+ _("Library list has unsupported version \"%s\""),
+ version);
+}
+
+/* Discard the constructed library list. */
+
+static void
+solib_target_free_library_list (void *p)
+{
+ VEC(lm_info_p) **result = p;
+ struct lm_info *info;
+ int ix;
+
+ for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++)
+ {
+ xfree (info->name);
+ VEC_free (CORE_ADDR, info->segment_bases);
+ xfree (info);
+ }
+ VEC_free (lm_info_p, *result);
+ *result = NULL;
+}
+
+/* The allowed elements and attributes for an XML library list.
+ The root element is a <library-list>. */
+
+const struct gdb_xml_attribute segment_attributes[] = {
+ { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+const struct gdb_xml_element library_children[] = {
+ { "segment", segment_attributes, NULL, GDB_XML_EF_REPEATABLE,
+ library_list_start_segment, NULL },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+const struct gdb_xml_attribute library_attributes[] = {
+ { "name", GDB_XML_AF_NONE, NULL, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+const struct gdb_xml_element library_list_children[] = {
+ { "library", library_attributes, library_children,
+ GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
+ library_list_start_library, NULL },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+const struct gdb_xml_attribute library_list_attributes[] = {
+ { "version", GDB_XML_AF_NONE, NULL, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+const struct gdb_xml_element library_list_elements[] = {
+ { "library-list", library_list_attributes, library_list_children,
+ GDB_XML_EF_NONE, library_list_start_list, NULL },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+static VEC(lm_info_p) *
+solib_target_parse_libraries (const char *library)
+{
+ struct gdb_xml_parser *parser;
+ VEC(lm_info_p) *result = NULL;
+ struct cleanup *before_deleting_result, *back_to;
+
+ back_to = make_cleanup (null_cleanup, NULL);
+ parser = gdb_xml_create_parser_and_cleanup (_("target library list"),
+ library_list_elements, &result);
+ gdb_xml_use_dtd (parser, "library-list.dtd");
+
+ before_deleting_result = make_cleanup (solib_target_free_library_list,
+ &result);
+
+ if (gdb_xml_parse (parser, library) == 0)
+ /* Parsed successfully, don't need to delete the result. */
+ discard_cleanups (before_deleting_result);
+
+ do_cleanups (back_to);
+ return result;
+}
+#endif
+
+static struct so_list *
+solib_target_current_sos (void)
+{
+ struct so_list *new_solib, *start = NULL, *last = NULL;
+ const char *library_document;
+ VEC(lm_info_p) *library_list;
+ struct lm_info *info;
+ int ix;
+
+ /* Fetch the list of shared libraries. */
+ library_document = target_read_stralloc (&current_target,
+ TARGET_OBJECT_LIBRARIES,
+ NULL);
+ if (library_document == NULL)
+ return NULL;
+
+ /* Parse the list. */
+ library_list = solib_target_parse_libraries (library_document);
+ if (library_list == NULL)
+ return NULL;
+
+ /* Build a struct so_list for each entry on the list. */
+ for (ix = 0; VEC_iterate (lm_info_p, library_list, ix, info); ix++)
+ {
+ new_solib = XZALLOC (struct so_list);
+ strncpy (new_solib->so_name, info->name, SO_NAME_MAX_PATH_SIZE - 1);
+ new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
+ strncpy (new_solib->so_original_name, info->name,
+ SO_NAME_MAX_PATH_SIZE - 1);
+ new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
+ new_solib->lm_info = info;
+
+ /* We no longer need this copy of the name. */
+ xfree (info->name);
+ info->name = NULL;
+
+ /* Add it to the list. */
+ if (!start)
+ last = start = new_solib;
+ else
+ {
+ last->next = new_solib;
+ last = new_solib;
+ }
+ }
+
+ /* Free the library list, but not its members. */
+ VEC_free (lm_info_p, library_list);
+
+ return start;
+}
+
+static void
+solib_target_special_symbol_handling (void)
+{
+ /* Nothing needed. */
+}
+
+static void
+solib_target_solib_create_inferior_hook (void)
+{
+ /* Nothing needed. */
+}
+
+static void
+solib_target_clear_solib (void)
+{
+ /* Nothing needed. */
+}
+
+static void
+solib_target_free_so (struct so_list *so)
+{
+ gdb_assert (so->lm_info->name == NULL);
+ xfree (so->lm_info->offsets);
+ VEC_free (CORE_ADDR, so->lm_info->segment_bases);
+ xfree (so->lm_info);
+}
+
+static void
+solib_target_relocate_section_addresses (struct so_list *so,
+ struct section_table *sec)
+{
+ int flags = bfd_get_section_flags (sec->bfd, sec->the_bfd_section);
+ CORE_ADDR offset;
+
+ /* Build the offset table only once per object file. We can not do
+ it any earlier, since we need to open the file first. */
+ if (so->lm_info->offsets == NULL)
+ {
+ struct symfile_segment_data *data;
+ int num_sections = bfd_count_sections (so->abfd);
+
+ so->lm_info->offsets = xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections));
+
+ data = get_symfile_segment_data (so->abfd);
+ if (data == NULL)
+ warning (_("Could not relocate shared library \"%s\": no segments"),
+ so->so_name);
+ else
+ {
+ ULONGEST orig_delta;
+ int i;
+ int num_bases = VEC_length (CORE_ADDR, so->lm_info->segment_bases);
+ CORE_ADDR *segment_bases = VEC_address (CORE_ADDR,
+ so->lm_info->segment_bases);
+
+ if (!symfile_map_offsets_to_segments (so->abfd, data,
+ so->lm_info->offsets,
+ num_bases, segment_bases))
+ warning (_("Could not relocate shared library \"%s\": bad offsets"),
+ so->so_name);
+
+ /* Find the range of addresses to report for this library in
+ "info sharedlibrary". Report any consecutive segments
+ which were relocated as a single unit. */
+ gdb_assert (num_bases > 0);
+ orig_delta = segment_bases[0] - data->segment_bases[0];
+
+ for (i = 1; i < data->num_segments; i++)
+ {
+ /* If we have run out of offsets, assume all remaining segments
+ have the same offset. */
+ if (i >= num_bases)
+ continue;
+
+ /* If this segment does not have the same offset, do not include
+ it in the library's range. */
+ if (segment_bases[i] - data->segment_bases[i] != orig_delta)
+ break;
+ }
+
+ so->addr_low = segment_bases[0];
+ so->addr_high = (data->segment_bases[i - 1]
+ + data->segment_sizes[i - 1]
+ /* FIXME this must be needed! + orig_delta */);
+
+ free_symfile_segment_data (data);
+ }
+ }
+
+ offset = so->lm_info->offsets->offsets[sec->the_bfd_section->index];
+ sec->addr += offset;
+ sec->endaddr += offset;
+}
+
+static int
+solib_target_open_symbol_file_object (void *from_ttyp)
+{
+ /* We can't locate the main symbol file based on the target's
+ knowledge; the user has to specify it. */
+ return 0;
+}
+
+static int
+solib_target_in_dynsym_resolve_code (CORE_ADDR pc)
+{
+ /* We don't have a range of addresses for the dynamic linker; there
+ may not be one in the program's address space. So only report
+ PLT entries (which may be import stubs). */
+ return in_plt_section (pc, NULL);
+}
+
+static struct target_so_ops solib_target_so_ops;
+
+extern initialize_file_ftype _initialize_solib_target; /* -Wmissing-prototypes */
+
+void
+_initialize_solib_target (void)
+{
+ solib_target_so_ops.relocate_section_addresses
+ = solib_target_relocate_section_addresses;
+ solib_target_so_ops.free_so = solib_target_free_so;
+ solib_target_so_ops.clear_solib = solib_target_clear_solib;
+ solib_target_so_ops.solib_create_inferior_hook
+ = solib_target_solib_create_inferior_hook;
+ solib_target_so_ops.special_symbol_handling
+ = solib_target_special_symbol_handling;
+ solib_target_so_ops.current_sos = solib_target_current_sos;
+ solib_target_so_ops.open_symbol_file_object
+ = solib_target_open_symbol_file_object;
+ solib_target_so_ops.in_dynsym_resolve_code
+ = solib_target_in_dynsym_resolve_code;
+
+ current_target_so_ops = &solib_target_so_ops;
+}
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